Motor plow working on the fixed cable system



June 3, 1924- J. ROBINSON ET AL MOTOR PLOW WQRKING ON THE FIXED CABLESYSTEM Filed Dec. 4, 1923 2 SheeLsSheet I ry K Ndrm w N. w K w m/ N o nn =15 x HPNHFlihPHiHH .n- 1 .-LGE .7 2 w w m oE h Jim'e '3, I924.

' J. ROBINSON ET AL MOTOR ?LOW WORKING ON THE FIXED CABLE SYSTEM FiledDec 4; 1223 5 2 Sheets-Sheet 2 IW INVENTQR-S' Wm Mal. WNW

Patented Jane 3, 192

as i e M MOTOR PLOW WORKING ON THE FIXED CABLE SYSTEM.

Application filed December 4, 1923.

This invention relates to that type of motor plow which is adapted tohaulitself along a cable anchored at the headlands, wherein one lengthof the cable is wound in upon a drum while the other length ispayed offfrom a second drum during each bout and in which the tractor frame ismounted on running and steering wheels and carries two sets of plowshares situated at opposite ends thereof adapted to be alternatelylowered into and raised out of the operative position; our object beingto provide motor plows of the type specified with means whereby theslack or paying off rope may be held clear of the plow shares in work.

According to our invention, two arms or poles are pivoted to the tractorframe, one at each end thereof, and the said pivoted arms or poles areeach provided with a spring which causes it to be moved in a horizontalplane so as to hold a pulley situated at its extreme or outer end inconstant contact with the adjacent length of the twopart cable; thearrangement being such as to cause the slack or paying-off rope to beheld clear of the set of plow shares in work.

In order that our invention may be clearly understood, we will proceedto describe the same with reference to the accompanying drawings;wherein Fig. 1 is a side elevation of a motor plow in which ourinvention is incorporated.

Fig. 2 isa plan View of the same. I

Fig. 3 is a sectional elevation on an enlarged scale illustrating theyielding means for holding the trolley arm in such a position that theslack in the paying-off rope is held clear of the plow shares when atwork, and

Fig. a is a plan of the parts shown in Fig. 3.

Referring to the drawings, the tractor frame 1 is mounted on runningwheels 2 Serial No. 678,436.

and carries an internal combustion engine 3 adapted, through mechanismnot shown, to drive the main shaft 4 having the winding drums 5 mountedthereon and which carry the two-part cable 6, while 7 are the plow shareframes fitted with plow shares 8; all of ordinary construction.

According to our invention, two arms or poles 9 are pivoted at 10 to thetractor frame 1, one at each end thereof, and the said arms or poles 9are each provided with a spring 11 which causes it to move in ahorizontal plane so as to hold a pulley 12 situated at its extreme orouter end in constant contact with the adjacent length of the two-partcable 6; the arrangement being such as to cause the slack or payingofi'part of the cable 6 to be held clear of the set of plow shares 8 atwork.

Assuming the tractor to be travelling forward, the pull on the taut orwindingin part of the cable 6 is suflicient to over come the spring 11of its corresponding or leading pulley-arm or pole 9 and render thelatter inoperative for the time being, while simultaneously the other orrear pulley-arm or pole 9, through the medium of its spring 11, holdsthe slack or paying-01f part of the cable 6 clear of the working plowshares 8 (see particularly Fig. 2). A At the end of the forward travel,and on the tension of the winding-in part of the cable 6 having beenrelaxed, the leading pulley-arm or pole 9 comes into action and movesthe now slack winding-in part of the cable 6 to one side of theimplement, when the positions of the plow shares 8 are reversed and theimplement started on its return bout which has the effect of renderingthe now leading pulley-arm or pole 9 inoperative.

lVha-t we'claim as our invention and desire to secure by Letters Patentis 1. In motor plows of the type specified; the combination with thetractor and its cable, of spring-operated pulley-arms or poles mountedon the tractor frame and being adapted to hold the slack or paying-offpart of the cable clear of the plow shares at work.

2. In motor plows of the type specified; the combination with thetractor and its cable, of two spring-operated pulley-arms or polespivoted to the tractor "frame, one at each end thereof, adapted throughthe medium of their springs to move in a horizontal plane so as to keeptheir pulleys in constant contact with the cable and hold the slack orpaying-off part of said cable clear of the plow shares at Work.

In Witness whereof We have hereunto set our hands in the presence of twoWitnesses.

JAMES ROBINSON. PERCY ROBINSON. lVitnesses:

J OHN J OWETT, CYRIL BELLAMY.

